How to preserve red raisins? Speaking of red raisins, I just think they are collectively called grapes here. Anyway, I just thought they were delicious, and I didn't really look at them. So, come with me to see how red grapes are preserved and what methods are available.
How to store red grapes? 1 Can red grapes be kept in the refrigerator?
Red grapes can be put in the refrigerator, just keep them cold.
Red raisins can be stored in the refrigerator like other fruits. Adjust the temperature of the refrigerator to 0 degrees Celsius and the humidity to 96%. It should be noted that other vegetables or fruits, especially bananas and apples, should not be placed in the place where red raisins are placed, because they are easy to ripen, release ethylene and accelerate the ripening of raisins, which is not conducive to storage.
Do you want to wash the red wine in the refrigerator?
Never wash it.
Don't wash raisins before putting them in the refrigerator. That is to say, after we buy it, you can eat as much as you want. Don't wash it all at once. Put the unwashed raisins covered with frost in the refrigerator to keep the original taste and flavor.
How long will it last after washing?
It is best to eat red raisins as soon as possible after washing, and only for 2-3 days at most.
Generally speaking, raisins can only be kept for two or three days, and they are easy to ripen, so it is best to eat them in two or three days, and you should not eat too much in one day. Remember not to buy too much every time.
How to save red grapes
1, not completely washed
Don't wash all the newly bought grapes. The surface of grapes is protected by nature. If washed, they will quickly oxidize and deteriorate. Wash as much as you should.
2, can't go to the head
Many friends buy fresh grapes and can't wait to remove the branches, which provides convenience for your cleaning and attracting insects. Because after removing the pedicel, the grapes will be exposed to the air, which will not only attract insects, but also accelerate oxidation.
Step 3 seal it with plastic wrap
Grapes don't need to be washed, put them directly on the plate and seal them with plastic wrap to prevent a lot of air from slowing down oxidation.
Step 4 refrigerate in the refrigerator
If the grapes are washed clean, they must be refrigerated to slow down the deterioration as much as possible. The temperature should not be too low or too high, just around zero.
5. Don't soak in water.
When you wash with water, there are many bubbles in the water. If you soak grapes in water for a long time, they will go bad more easily.
6, can't be stacked
If some grapes are found to have gone bad, they should be thrown away separately. If stacked together, it will also corrode grapes and deteriorate.
How to preserve red grapes? 2. Preservation methods of red grapes.
1. Red grapes are stored in fresh-keeping bags.
Red grapes will be stored in special' fresh-keeping bags' after harvest, such as modified atmosphere and temperature-permeable bags of PVC and PE, which are the most suitable fresh-keeping bags for red grapes. The quality of red grapes in these fresh-keeping bags has not changed much, and the grape stems always remain bright green, so the water of grapes will not be lost. Bagged grapes can be kept fresh for several months by putting them in special warehouses.
2. Preserve red grapes with preservatives.
Red grape is a grape variety that is particularly sensitive to oxygen. When storing, CT compound special preservative can be used. The dosage of preservative should be seven bags per five kilograms of grapes, and a layer of temperature-regulating fresh-keeping film should be added. This method can also make the shelf life of red grapes as long as four or five months.
3. Red grapes can be refrigerated.
It is also a good way to preserve red grapes in cold storage. After it enters the cold storage, it needs to be precooled in the environment of MINUS one to two degrees, so that the temperature of red grapes drops rapidly. After 24 hours, the temperature of red grapes can drop to about zero. At this time, it can be directly packaged and stored in the cold storage area, or it can keep the red grapes from deteriorating for three or four months.
How to preserve red raisins Method 3: Keep red raisins in the fresh-keeping refrigerator.
After entering the cold storage, it needs to be precooled at-1℃~-2℃ to make the temperature of red grapes drop rapidly. After 24 hours, the temperature of red grapes can drop to about zero. At this time, it can be directly packaged and stored in fresh-keeping cold storage, and it can also keep red grapes from deteriorating for 3~4 months.
Hongti fresh-keeping refrigerator is a storage project to keep grapes fresh. Grapes are berries, which are not suitable for storage and transportation, and more than 70% are used for fresh food. However, grapes are easy to lose water, shell and rot after picking. Therefore, it is necessary to pack grapes in cold storage to ensure the freshness of grapes.
Extended data:
1. Fresh-keeping skills of red-mention fresh-keeping cold storage;
1. Before storage, the packaging should be disinfected and precooled, and the grape warehouse should be disinfected;
These grapes should be put into the warehouse and palletized. After the fruit is picked, it should be precooled in stages. One-time storage should not be too much, generally not exceeding 65,438+00% of the total storage. For example, the cold storage has a total storage of 200 tons and a one-time storage of 20 tons. Grapes should be placed in the cold storage, with reasonable layout, no waste of space and good ventilation.
3. In the process of grape cold storage management, it is necessary to adjust the temperature, humidity and ventilation of red grape fresh-keeping cold storage:
(1) The temperature of the red grape fresh-keeping cold storage should be controlled at-1-0 degrees Celsius. If the temperature is too high, the grapes will rot; if the temperature is too low, the grapes will freeze. During storage, multi-point inspection should be carried out every day.
(2) Adjust the humidity of grapes. The humidity of grapes in cold storage should be 90%-95%. Too high or too low humidity is not conducive to the cold storage of grapes. When grapes are stored in bags, the humidity in the bags should be above 95%.
(3) The fresh-keeping cold storage of red grapes should be ventilated. Through ventilation, the concentration of carbon dioxide and irritating gases (ethylene, acetaldehyde, ethanol) in the cold storage can be reduced. Ventilation should be carried out in the morning or at night when the temperature is low, and avoid rainy and foggy weather as much as possible.
(4) Frosting and defrosting of red-mention fresh-keeping cold storage. Frost on the evaporator surface of cold storage reduces the humidity in the warehouse, hinders the heat conduction in the pipeline and affects the refrigeration effect.
Second, the defrosting measures mainly include:
(1) Introduce the hot gas condensate directly and flow through the evaporator. When the storage temperature rises to 65438 0℃, turn off the compressor. The temperature of evaporator rises, which causes the surface frost to melt or peel off;
(2) spray water regularly to cool the evaporator to prevent frost layer from forming;
(3) continuously spraying a solution with high freezing point temperature to the evaporator, such as 5%-8% concentrated brine, to prevent frosting;
(4) Electric heaters are used for heating and defrosting.